Mark was 18 months from his planned retirement date when he ran the numbers one more time. Thirty-one years at the agency, a solid FERS annuity, a TSP balance he was proud of. Then a coworker asked him a casual question over lunch: "You've had FEHB the whole time, right?"

He hadn't. Six years earlier, he had waived coverage and joined his wife's employer plan, which was cheaper at the time. He re-enrolled in FEHB at the next Open Season, which put him about three and a half years into his five-year clock. He had no idea there was a clock.

Mark's story has a decent ending, but only because someone asked the question in time. Plenty of people find out too late.

What the rule actually says

To carry FEHB into retirement, you generally need to have been enrolled in an FEHB plan for the five years of service immediately before your retirement date. Not any five years. The last five. If you have less than five years of FEHB eligibility in total, you need to have been enrolled continuously since your first opportunity to sign up.

Two details trip people up.

First, the coverage can be as an enrollee or as a covered family member. If you spent part of that window on your spouse's FEHB Self Plus One or Family enrollment, that time can count. People often miss this and assume they have a gap when they don't.

Second, it has to be FEHB, not just "health insurance." Coverage through a private employer plan, a marketplace policy, or military coverage does not count toward the five years, no matter how good it was.

The rule applies when you retire on an immediate annuity. A deferred annuity, where you leave federal service and wait until your minimum retirement age or 62 to collect, does not come with FEHB eligibility. That is a different path with different planning.

Where the clock gets broken

Most five-year problems come from a short list of decisions that seemed reasonable at the time.

  • Waiving FEHB for a spouse's plan. Cheaper premiums or better local networks make this tempting. It is also the most common cause of a gap.
  • Relying on TRICARE. Reservists and military retirees who work in federal civilian jobs sometimes waive FEHB because they have TRICARE. That can be a good financial decision during your working years. It can also leave you short of five years when you want to retire.
  • Dropping coverage after a life event. A divorce, a move, or a child aging off the plan sometimes leads to a lapse that nobody notices.
  • Breaks in service. If you left federal employment and came back, the five-year window is measured against the service immediately before retirement. Your history matters and the details are fact specific.
  • Temporary Continuation of Coverage. TCC is a bridge, not a substitute. Time spent on it after separation does not behave like regular FEHB enrollment for this purpose.

Notice that none of these involve doing anything wrong. They involve making a perfectly sensible choice without knowing it had a retirement price tag.

What to do if you are short

If you are inside the five-year window and not enrolled, the fix is usually straightforward but time sensitive. You can typically enroll during the annual Open Season or after a qualifying life event, such as marriage or loss of other coverage. Once you are back in, the clock runs again from that enrollment, or from the effective date of your coverage as a family member.

Back to Mark. His re-enrollment had taken effect at the start of a plan year, and he had been covered continuously since. He needed another year and a half of coverage, which lined up with his planned date. His plan survived. A friend of his, who had dropped coverage nine months earlier, had to push back his retirement or accept a very different health insurance picture.

In rare cases, OPM can waive the requirement, but you should not plan around a waiver. Treat it as a long shot. Your agency's benefits office or HR specialist can confirm your coverage history and flag problems well before your retirement paperwork goes in.

Why this matters beyond the insurance card

FEHB gets treated as a side issue in retirement planning. It is not. Health insurance is often one of the largest recurring costs in your budget, and the structure of FEHB shapes your income plan.

Consider the plumbing. Premiums are usually deducted directly from your annuity, which means your net pension check is smaller than the gross figure on your estimate. Premium amounts vary by plan and change every year. For current rates and plan comparisons, check OPM's healthcare and insurance pages at opm.gov rather than relying on last year's numbers.

Then consider what happens if FEHB is not available. Private coverage before Medicare eligibility at 65 can run well above what many federal retirees expect to pay. If you retire at 57, that gap lasts eight years. For a couple, that can mean a sizable annual cost that your TSP and IRA withdrawals have to cover. Your withdrawal rate, your tax bracket, and how long your savings last all change.

This is the coordination piece. Your annuity, your TSP, your IRA, and your FEHB status are one system. If one piece fails, the others absorb the strain.

Medicare, and keeping FEHB for life

Once you are in, FEHB can follow you for life, and you can change plans during Open Season each year. When you turn 65, you can add Medicare Part B and keep FEHB as well. Many retirees find the combination keeps out-of-pocket costs low, though Part B carries its own premium, which is set by the government each year. Check Medicare.gov for current figures.

One warning. If you drop FEHB in retirement, it can be very hard to get back in, and the exceptions are narrow. Do not cancel coverage to save money without confirming whether you can return. Once you are out, you may be out for good.

Spouse coverage has its own catch. To keep a spouse on your FEHB plan after you die, you generally need to provide a survivor annuity. That choice is made at retirement and affects your pension amount, so decide it deliberately rather than at the last minute.

A practical checklist

Pull this together at least two years before your target date, not two months.

  1. Request your coverage history from your HR office and confirm every FEHB enrollment in the last five years.
  2. Verify whether any period of waived coverage, TCC, or non-FEHB insurance overlaps the window.
  3. If you have a gap, enroll at the next opportunity and recalculate your earliest retirement date.
  4. Estimate your FEHB premium using current OPM tables, then subtract it from your projected annuity to see your real take-home number.
  5. Decide on survivor benefits with your spouse, with FEHB continuation in mind.
  6. Check how your TSP and IRA withdrawal plan holds up after premiums. For tax rules on withdrawals, see irs.gov and tsp.gov.

The five-year rule is simple to state and easy to forget. It rewards people who check early and punishes people who assume. Mark checked in time. You still can.